If the base zoning is RSA5, single family is the allowed use & lot area is not relevant. 

Setting up a US based entity is your first step, you are already doing that it seems. 

You should definitely ask what he/she meant and if it's a suggestion or requirement based on the amount of properties.

But typically these are already home owners so it may be a better than average tenant base as far thrashing the property. 

I know he has been looking for some networking in Richmond.We have a Chicago-based GC-tech (general contracting technology) company but expanding into Richmond.

Maybe because at the end of the year based on your earned income you can right off depreciation and other tax benefits that saves you $25K?

The goal I would think is to increase your rental income and solar might do that but there are alternative investments in your property that might get you higher returns.

Now, we are currently establishing business lines of credit, unsecured, which are based on our personal credit (we're each doing this through separate LLCs).

Per this NY Times article, the average American knows around 600 people.https://www.nytimes.com/2013/02/19/science/the-average-american-knows-how-many-people.html#:~:text=The%20average%20American%20knows%20about,do%20you%20know%20named%20Kevin%3FPer the US Census Bureau, the average American moves 11.7 time in their life, which based upon an approximate lifespan of 84 years, works out to be about every 7 years.https://www.census.gov/topics/population/migration/guidance/calculating-migration-expectancy.html#:~:text=Using%202007%20ACS%20data%2C%20it,one%20move%20per%20single%20yearSo, if the average American knows 600 people and they each move about every 7 years, that means that the average American knows around 85 people that move in any given year.How many of those moves do you want to be involved in?

That being said, your allocation to net worth/PFS should be calculated based on shares you own in the deal.